Guanajuato Sur Wastewater Treatment Plant, Guanajuato, Mexico

Guanajuato Sur is a wastewater treatment plant located in the city of Guanajuato, in the state of Guanajuato, Mexico. The plant serves a population of approximately 45,636 people, placing it in the medium agglomeration category. As part of Mexico's wastewater infrastructure, it plays a key role in managing municipal sewage for this historic city. Under Mexican regulations (NOM-001-SEMARNAT), wastewater treatment plants are required to meet specific discharge standards based on the receiving water body. For plants serving populations of this scale, secondary treatment is typically expected to reduce organic matter and suspended solids. The regulatory framework ensures compliance with national water quality objectives. The treated effluent from Guanajuato Sur is discharged into the local watershed, which ultimately drains into the Lerma River basin. The Lerma River flows into Lake Chapala, Mexico's largest freshwater lake, which supports diverse aquatic life and provides water for agriculture and human consumption. Protecting this downstream ecosystem is critical for regional water security.

The plant discharges into the Lerma River basin, which flows into Lake Chapala, a vital freshwater resource in central Mexico. The watershed supports agricultural irrigation and provides habitat for native fish species. Downstream water quality is important for maintaining ecological balance and ensuring safe water for communities relying on Lake Chapala.